The photoelectric emission is possible if the wavelength of the incident light is less than that of yellow light
Answer:
The work done on the box is 80 J.
Explanation:
Given that,
Weight of box = 40 N
Distance = 2 meter
We need to calculate the work done
Using formula of work done


Where, x = distance
mg = weight
Put the value into the formula



Hence, The work done on the box is 80 J.
Even tho one is stronger then the other... they are both alike because they are still nuclear forces.